<template>
  <div class="star" :class="starType">
    <span v-for="itemClass in itemClasses" class="star-item" :class="itemClass" track-by="$index"></span>
  </div>
</template>

<script>
  const LENGTH=5;
  const CLS_ON='on';
  const CLS_OFF='off';
  const CLS_HALF='half';
  export default {
    name: "star",
    props: {
      size: {
        type: Number
      },
      score: Number
    },
    computed: {
      starType() {
        return 'star-' + this.size
      },
      itemClasses(){
        let result=[];
        let score=Math.floor(this.score*2)/2;
        let hasDetail=score%1!==0;
        let integer=Math.floor(score);
        for (let i = 0; i < integer; i++) {
          result.push(CLS_ON);
        };
        if(hasDetail){
          result.push(CLS_HALF)
        };
        while (result.length<LENGTH){
          result.push(CLS_OFF)
        }
        return result;
      }
    }
  }
</script>
<style scoped lang="stylus" rel="stylesheet/stylus">
  @import "../../common/stylus/mixin.styl"
  .star
    font-size 0
    .star-item
      display inline-block
      background-repeat no-repeat
    &.star-48
      .star-item
        width: 20px
        height: 20px
        background-size 20px 20px
        margin-right 22px
        &:last-child
          margin-right 0px
        &.on
          bg-image('star48_on')
        &.off
          bg-image('star48_off')
        &.half
          bg-image('star48_half')
    &.star-36
      .star-item
        width: 15px
        height: 15px
        background-size 15px 15px
        margin-right 6px
        &:last-child
          margin-right 0px
        &.on
          bg-image('star36_on')
        &.off
          bg-image('star36_off')
        &.half
          bg-image('star36_half')
    &.star-24
      .star-item
        width: 10px
        height: 10px
        background-size 10px 10px
        margin-right 3px
        &:last-child
          margin-right 0px
        &.on
          bg-image('star24_on')
        &.off
          bg-image('star24_off')
        &.half
          bg-image('star24_half')
</style>
